Dog kennels can be useful. I mean the kind that gets used outside, like a run. Many of them have a metal frame, filled with wire mesh or chain link, and come as a set of panels. You can take the panels apart and store them neatly against a wall, and set it up again later. Some are 5 or 6 feet high, but some are only 3-4 feet high. (It makes a big difference to how awkward the panels are to handle!)
Because dog kennels are meant to contain dogs, they are also pretty good at keeping dogs OUT. Depending on the kennel, some come with a top as well, and some are sized so you can use an extra side as a top.
The major problem with a dog kennel is that the holes are large enough for a raccoon to reach through. You could solve that by confining the chickens in a crate or cage, inside the kennel, during the night. That can keep them far enough from the sides that a raccoon cannot reach them (if only its arm but not its body goes through the mesh, it can only reach so far.)
